Welcome to our dedicated page for Calamos Strategic Total Return SEC filings (Ticker: CSQ), a comprehensive resource for investors and traders seeking official regulatory documents including 10-K annual reports, 10-Q quarterly earnings, 8-K material events, and insider trading forms.
calamos investments is a diversified global investment manager committed to excellence in investment management and client service. calamos was founded in 1977 by john p. calamos, sr. who sought innovative, risk-managed approaches to grow and preserve capital. today the firm is recognized as a pioneer in utilizing convertible securities and alternative investments to manage risk, and has retained its character as a boutique investment firm. headquartered in the chicago metropolitan area, the firm also has offices in london, new york, san francisco, and the miami area. calamos offers strategies through separately managed portfolios, mutual funds, closed-end funds, private funds and ucits funds. clients include major corporations, pension funds, endowments, foundations and individuals, as well as the financial advisors and consultants who serve them. for more information, please visit www.calamos.com.Calamos Strategic Total Return Fund filed an amended Schedule 13G/A showing that Athene and Apollo-affiliated entities jointly report beneficial ownership of 1,920,000 Series F Mandatory Redeemable Preferred Shares, representing 48% of this share class. These entities report shared voting and shared dispositive power over all of these shares, with no sole voting or dispositive authority.
The reported percentage is based on 4,000,000 Series F shares outstanding as of April 30, 2025, as disclosed in the fund’s shareholder report. The filing states the securities are held in the ordinary course of business and not for the purpose of changing or influencing control of the fund.
This Form N-CEN is an annual report for a registered investment company associated with symbol CSQ. It largely provides structural and operational information about the fund, including directors, service providers, custodians, brokers, and compliance arrangements.
The report shows that the fund engaged in securities lending, with a monthly average value of portfolio securities on loan of 578,411,466.21000000 during the reporting period. Aggregate brokerage activity was meaningful, with total brokerage commissions paid by the fund of 507,107.86000000. Principal trading activity is detailed dealer by dealer, with total value of purchases and sales (excluding maturing securities) including 454,256,289.24000000 with one dealer and 261,088,257.91000000 with another, illustrating substantial turnover through multiple counterparties.
The filing also notes that total commissions paid to an affiliated broker-dealer for the period were 0.00000000, and lists numerous custodians and service providers, giving investors transparency into the fund’s operational framework rather than its performance or returns.
Calamos Strategic Total Return Fund (CSQ)
All funds follow managed or level distribution policies, with current monthly distributions per share as of October 31, 2025 of $0.0950 for CHI, $0.1000 for CHY, $0.1025 for CSQ, $0.1950 for CCD, $0.0500 for CHW, $0.0800 for CGO and $0.1400 for CPZ. Recent distributions were largely sourced from short‑term or long‑term capital gains rather than return of capital.
The funds use leverage through a State Street Bank credit facility and mandatory redeemable preferred shares. For example, CSQ’s borrowings and MRP Shares together represented 29.1% of managed assets, with interest charged at Overnight Bank Financing Rate plus 0.52% (4.38% as of October 31, 2025). Hypothetical tables show how this leverage can amplify both gains and losses for common shareholders.
John S. Koudounis filed an amended Form 3 reporting his beneficial ownership in Calamos Strategic Total Return Fund (CSQ). The amendment updates his relationship to the issuer: he is listed as an officer (Vice President) and as a trustee effective 09/01/2025. The statement shows 15,830 shares of common stock owned directly. The amendment references an original filing dated 07/11/2016 and is signed on 09/09/2025.
John S. Koudounis filed an amended Form 3 reporting initial beneficial ownership in Calamos Strategic Total Return Fund (CSQ). The filing shows 15,830 shares of common stock held directly. The amendment updates his relationship with the issuer to reflect that he is an officer (Vice President) and became a trustee effective 09/01/2025. The form is signed and dated 09/09/2025 and contains no derivative holdings or other transactions.
Calamos Strategic Total Return Fund insider Hugh Armstrong filed an initial ownership report showing no holdings. The Form 3 indicates that Armstrong is related to the fund in an "Other" capacity as a trustee, but the accompanying ownership tables list no non-derivative or derivative securities. The explanatory note explicitly states that no securities are beneficially owned, meaning Armstrong reports no direct or indirect ownership of Calamos Strategic Total Return Fund shares as of the event date.
The filing is an amendment to a Schedule 13G reporting that a group of related Apollo entities and Athene Annuity and Life Company collectively hold 1,920,000 Series F Mandatory Redeemable Preferred Shares of Calamos Strategic Total Return Fund. That holding represents 48.0% of the 4,000,000 MRPS outstanding (per the issuer's certified shareholder report dated April 30, 2025). No reporting person claims sole voting or dispositive power; each reports zero sole power and shared voting and dispositive power over 1,920,000 shares. The filing states the securities were acquired and are held in the ordinary course of business and not to change or influence control of the issuer.